Introduce ThreadedInputConnection behind a switch

content/public/android/java/src/org/chromium/content/browser/input/ImeAdapter.java

Index: content/public/android/java/src/org/chromium/content/browser/input/ImeAdapter.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/input/ImeAdapter.java b/content/public/android/java/src/org/chromium/content/browser/input/ImeAdapter.java
index 61aceec9bd50f8d0cf4baa19c0d03010251d39bc..c3ad20c6c7e25687a87bf111dbd70f5669ce59eb 100644
--- a/content/public/android/java/src/org/chromium/content/browser/input/ImeAdapter.java
+++ b/content/public/android/java/src/org/chromium/content/browser/input/ImeAdapter.java
@@ -7,8 +7,6 @@ package org.chromium.content.browser.input;
 import android.content.res.Configuration;
 import android.os.ResultReceiver;
 import android.os.SystemClock;
-import android.text.Editable;
-import android.text.Selection;
 import android.text.SpannableString;
 import android.text.style.BackgroundColorSpan;
 import android.text.style.CharacterStyle;
@@ -19,12 +17,14 @@ import android.view.View;
 import android.view.inputmethod.BaseInputConnection;
 import android.view.inputmethod.EditorInfo;
 
+import org.chromium.base.CommandLine;
 import org.chromium.base.Log;
 import org.chromium.base.VisibleForTesting;
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.annotations.JNINamespace;
 import org.chromium.blink_public.web.WebInputEventModifier;
 import org.chromium.blink_public.web.WebInputEventType;
+import org.chromium.content.common.ContentSwitches;
 import org.chromium.ui.base.ime.TextInputType;
 import org.chromium.ui.picker.InputDialogContainer;
 
@@ -90,15 +90,10 @@ public class ImeAdapter {
 
     private long mNativeImeAdapterAndroid;
     private InputMethodManagerWrapper mInputMethodManagerWrapper;
-    private AdapterInputConnection mInputConnection;
-    private AdapterInputConnectionFactory mInputConnectionFactory;
-    private final ImeAdapterDelegate mViewEmbedder;
+    private ChromiumBaseInputConnection mInputConnection;
+    private ChromiumBaseInputConnection.Factory mInputConnectionFactory;
 
-    // This holds the state of editable text (e.g. contents of <input>, contenteditable) of
-    // a focused element.
-    // Every time the user, IME, javascript (Blink), autofill etc. modifies the content, the new
-    // state must be reflected to this to keep consistency.
-    private final Editable mEditable;
+    private final ImeAdapterDelegate mViewEmbedder;
 
     private int mTextInputType = TextInputType.NONE;
     private int mTextInputFlags;
@@ -114,49 +109,31 @@ public class ImeAdapter {
     public ImeAdapter(InputMethodManagerWrapper wrapper, ImeAdapterDelegate embedder) {
         mInputMethodManagerWrapper = wrapper;
         mViewEmbedder = embedder;
-        mInputConnectionFactory = new AdapterInputConnectionFactory();
-        mEditable = Editable.Factory.getInstance().newEditable("");
-        Selection.setSelection(mEditable, 0);
+        if (CommandLine.getInstance().hasSwitch(ContentSwitches.USE_IME_THREAD)) {
+            mInputConnectionFactory = new ChromiumInputConnectionFactory();
+        } else {
+            mInputConnectionFactory = new AdapterInputConnection.Factory();
+        }
         // Deep copy newConfig so that we can notice the difference.
         mCurrentConfig = new Configuration(
                 mViewEmbedder.getAttachedView().getResources().getConfiguration());
     }
 
     /**
-     * Default factory for AdapterInputConnection classes.
-     */
-    static class AdapterInputConnectionFactory {
-        AdapterInputConnection get(View view, ImeAdapter imeAdapter, int initialSelStart,
-                int initialSelEnd, EditorInfo outAttrs) {
-            return new AdapterInputConnection(
-                    view, imeAdapter, initialSelStart, initialSelEnd, outAttrs);
-        }
-    }
-
-    /**
      * @see View#onCreateInputConnection(EditorInfo)
      */
-    public AdapterInputConnection onCreateInputConnection(EditorInfo outAttrs) {
+    public ChromiumBaseInputConnection onCreateInputConnection(EditorInfo outAttrs) {
         // Without this line, some third-party IMEs will try to compose text even when
-        // not on an editable node. Even when we return null here, key events can still go through
-        // ImeAdapter#dispatchKeyEvent().
+        // not on an editable node. Even when we return null here, key events can still go
+        // through ImeAdapter#dispatchKeyEvent().
         if (mTextInputType == TextInputType.NONE) {
             mInputConnection = null;
-            Log.d(TAG, "onCreateInputConnection returns null.");
+            Log.d(TAG, "onCreateInputConnection: null");
             return null;
         }
-
-        if (!isTextInputType(mTextInputType)) {
-            // Although onCheckIsTextEditor will return false in this case, the EditorInfo
-            // is still used by the InputMethodService. Need to make sure the IME doesn't
-            // enter fullscreen mode.
-            outAttrs.imeOptions = EditorInfo.IME_FLAG_NO_FULLSCREEN;
-        }
-        int initialSelStart = Selection.getSelectionStart(mEditable);
-        int initialSelEnd = outAttrs.initialSelEnd = Selection.getSelectionEnd(mEditable);
         mInputConnection = mInputConnectionFactory.get(
-                mViewEmbedder.getAttachedView(), this, initialSelStart, initialSelEnd, outAttrs);
-        Log.d(TAG, "onCreateInputConnection");
+                mViewEmbedder.getAttachedView(), this, mTextInputType, mTextInputFlags, outAttrs);
+        Log.d(TAG, "onCreateInputConnection: ", mInputConnection);
         return mInputConnection;
     }
 
@@ -171,49 +148,18 @@ public class ImeAdapter {
     }
 
     @VisibleForTesting
-    void setInputConnectionFactory(AdapterInputConnectionFactory factory) {
+    void setInputConnectionFactory(ChromiumBaseInputConnection.Factory factory) {
         mInputConnectionFactory = factory;
     }
 
     /**
-     * Set the current active InputConnection when a new InputConnection is constructed.
-     * @param inputConnection The input connection that is currently used with IME.
-     */
-    void setInputConnection(AdapterInputConnection inputConnection) {
-        mInputConnection = inputConnection;
-    }
-
-    /**
      * Get the current input connection for testing purposes.
      */
     @VisibleForTesting
-    public AdapterInputConnection getInputConnectionForTest() {
+    public ChromiumBaseInputConnection getInputConnectionForTest() {
         return mInputConnection;
     }
 
-    /**
-     * @return The Editable instance that will be shared across AdapterInputConnection instances.
-     */
-    Editable getEditable() {
-        return mEditable;
-    }
-
-    /**
-     * Should be used only by AdapterInputConnection.
-     * @return The input type of currently focused element.
-     */
-    int getTextInputType() {
-        return mTextInputType;
-    }
-
-    /**
-     * Should be used only by AdapterInputConnection.
-     * @return The input flags of the currently focused element.
-     */
-    int getTextInputFlags() {
-        return mTextInputFlags;
-    }
-
     private static int getModifiers(int metaState) {
         int modifiers = 0;
         if ((metaState & KeyEvent.META_SHIFT_ON) != 0) {
@@ -278,8 +224,10 @@ public class ImeAdapter {
     public void updateState(String text, int selectionStart, int selectionEnd, int compositionStart,
             int compositionEnd, boolean isNonImeChange) {
         if (mInputConnection == null) return;
-        mInputConnection.updateState(text, selectionStart, selectionEnd, compositionStart,
-                compositionEnd, isNonImeChange);
+        boolean singleLine = mTextInputType != TextInputType.TEXT_AREA
+                && mTextInputType != TextInputType.CONTENT_EDITABLE;
+        mInputConnection.updateStateOnUiThread(text, selectionStart, selectionEnd, compositionStart,
+                compositionEnd, singleLine, isNonImeChange);
     }
 
     /**
@@ -366,8 +314,7 @@ public class ImeAdapter {
     public void moveCursorToSelectionEnd() {
         Log.d(TAG, "movecursorToEnd");
         if (mInputConnection != null) {
-            int selectionEnd = Selection.getSelectionEnd(mEditable);
-            mInputConnection.setSelection(selectionEnd, selectionEnd);
+            mInputConnection.moveCursorToSelectionEndOnUiThread();
         }
     }
 
@@ -387,9 +334,7 @@ public class ImeAdapter {
     public boolean dispatchKeyEvent(KeyEvent event) {
         Log.d(TAG, "dispatchKeyEvent: action [%d], keycode [%d]", event.getAction(),
                 event.getKeyCode());
-        if (mInputConnection != null) {
-            return mInputConnection.sendKeyEvent(event);
-        }
+        if (mInputConnection != null) return mInputConnection.sendKeyEventOnUiThread(event);
         return sendKeyEvent(event);
     }
 
@@ -412,7 +357,7 @@ public class ImeAdapter {
      */
     void restartInput() {
         mInputMethodManagerWrapper.restartInput(mViewEmbedder.getAttachedView());
-        if (mInputConnection != null) mInputConnection.onRestartInput();
+        if (mInputConnection != null) mInputConnection.onRestartInputOnUiThread();
     }
 
     /**
@@ -481,9 +426,10 @@ public class ImeAdapter {
     }
 
     @VisibleForTesting
-    void finishComposingText() {
-        if (mNativeImeAdapterAndroid == 0) return;
+    boolean finishComposingText() {
+        if (mNativeImeAdapterAndroid == 0) return false;
         nativeFinishComposingText(mNativeImeAdapterAndroid);
+        return true;
     }
 
     boolean sendKeyEvent(KeyEvent event) {
@@ -546,7 +492,7 @@ public class ImeAdapter {
      * @param end The end of the composition.
      * @return Whether the native counterpart of ImeAdapter received the call.
      */
-    boolean setComposingRegion(CharSequence text, int start, int end) {
+    boolean setComposingRegion(int start, int end) {
         if (mNativeImeAdapterAndroid == 0) return false;
         nativeSetComposingRegion(mNativeImeAdapterAndroid, start, end);
         return true;
@@ -560,6 +506,15 @@ public class ImeAdapter {
         }
     }
 
+    /**
+     * Send a request to the native counterpart to give the latest text input state update.
+     */
+    boolean requestTextInputStateUpdate() {
+        if (mNativeImeAdapterAndroid == 0) return false;
+        nativeRequestTextInputStateUpdate(mNativeImeAdapterAndroid);
+        return true;
+    }
+
     @CalledByNative
     private void populateUnderlinesFromSpans(CharSequence text, long underlines) {
         Log.d(TAG, "populateUnderlinesFromSpans: text [%s], underlines [%d]", text, underlines);
@@ -594,32 +549,22 @@ public class ImeAdapter {
 
     private native boolean nativeSendSyntheticKeyEvent(long nativeImeAdapterAndroid,
             int eventType, long timestampMs, int keyCode, int modifiers, int unicodeChar);
-
     private native boolean nativeSendKeyEvent(long nativeImeAdapterAndroid, KeyEvent event,
             int action, int modifiers, long timestampMs, int keyCode, int scanCode,
             boolean isSystemKey, int unicodeChar);
-
     private static native void nativeAppendUnderlineSpan(long underlinePtr, int start, int end);
-
     private static native void nativeAppendBackgroundColorSpan(long underlinePtr, int start,
             int end, int backgroundColor);
-
     private native void nativeSetComposingText(long nativeImeAdapterAndroid, CharSequence text,
             String textStr, int newCursorPosition);
-
     private native void nativeCommitText(long nativeImeAdapterAndroid, String textStr);
-
     private native void nativeFinishComposingText(long nativeImeAdapterAndroid);
-
     private native void nativeAttachImeAdapter(long nativeImeAdapterAndroid);
-
     private native void nativeSetEditableSelectionOffsets(long nativeImeAdapterAndroid,
             int start, int end);
-
     private native void nativeSetComposingRegion(long nativeImeAdapterAndroid, int start, int end);
-
     private native void nativeDeleteSurroundingText(long nativeImeAdapterAndroid,
             int before, int after);
-
     private native void nativeResetImeAdapter(long nativeImeAdapterAndroid);
+    private native void nativeRequestTextInputStateUpdate(long nativeImeAdapterAndroid);
 }